I have a problem with this utility function question. Can you show me step by step how to answer the points referred in a,b and c?

Deb and Frank have the following utility functions: 1- . Up = :63 + 2111;; and U1? = xyp " mm a 6 (0,1). Their endowment is one unit of good y for Deb and one unit of good x for Frank. a} Determine the expenditure function for Frank. What happens with the expenditure if all prices are multiplied by the same number? b) What is the elasticity of substitution for Deb? what is the implication for the income and substitution effects? c) Interpret now x and y as follows. In a risky setting, x is the am0unt of money in state X and y is the amount of income in state Y. The expected utility functions of Deb and Frank are, respectively